Jennifer Aniston burst into tears in her trailer while filming in New York — telling an assistant that a scene “reminded her of Brad Pitt,” a source said.

The unlucky-in-love actress was late coming out of her trailer while filming “The Bounty” with Gerard Butler a few weeks ago. The source tells Page Six that when an assistant went to fetch Aniston, she was in tears, and said, “I need a moment. This scene reminds me of Brad and me.”

Aniston pulled herself together and managed to put on a smile when she eventually emerged from her trailer. The insider added, “While she enjoyed flirting with Gerard on set and put a brave face on every day, privately she is still very fragile.”

Since Pitt dumped her back in 2005, Aniston has been involved with Vince Vaughn, Paul Sculfor and John Mayer. Describing how she had come to terms with her single-girl label, she told Elle’s September issue, “If I’m the emblem for ‘this is what it looks like to be the lonely girl getting on with her life,’ so be it.”

Aniston’s spokesman, Stephen Huvane, says the story about her crying in the trailer is “ridiculous . . . it never happened.”

Meanwhile, Pitt’s looking to buy property surrounding his and Angelina Jolie‘s French estate, Chateau Miraval, to build an airport so the family can fly in and out unseen by paparazzi.

Brangelina plunked down $60 million for the 1,000-acre estate in the South of France, which features 35 bedrooms, a vineyard, lake, forest and a moat.

A source said, “One thing he loves about the estate is the privacy it affords. Nobody can get near it. So with Angelina completing her pilot’s license, their own airstrip would give them total freedom to come and go.”